Dark matter annihilation and decay profiles for the Reticulum II dwarf spheroidal galaxy

V. Bonnivard (1) , C. Combet (1) , D. Maurin (1) , A. Geringer-Sameth , S.M. Koushiappas , M.G. Walker , M. Mateo , E. Olszewski , J.I. Bailey Iii

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter. In this work, we reconstruct the dark matter annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum~II. This is done using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System (M2FS). We find Reticulum~II to have one of the highest J-factor when compared to the other Milky Way dSphs. We have also checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum~II may provide a unique window on dark matter particle properties.

Mots clés: dark matter; galaxies: dwarf; galaxies: individual (Reticulum II); gamma rays: galaxies; methods: statistical; stars: kinematics and dynamics

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

V. Bonnivard, C. Combet, D. Maurin, A. Geringer-Sameth, S.M. Koushiappas, et al.. Dark matter annihilation and decay profiles for the Reticulum II dwarf spheroidal galaxy. The Astrophysical journal letters, 2015, 808 (2), pp.L36. ⟨10.1088/2041-8205/808/2/L36⟩. ⟨in2p3-01142811⟩